4 HYMENOPTEKA. 



in the centre. Tegulse shining. The tubercles, a larger spot on the mesopleurae, and 

 another at the end of the metapleura?, silvery-white. The apical segments of the 

 abdomen deep velvety-black. Hind coxae covered with a silvery pubescence. The 

 third antennal joint one quarter longer than the fourth. 



The male has the clypeus and face densely covered with a golden pubescence ; the 

 clypeus produced at the apex into a short blunt tooth and projecting outwardly ; and 

 the mesosternum not or hardly tuberculate. 



Note. — A male example before me, of which the armature is figured on Tab. I. fig. 6, 

 clearly represents a distinct species from A. miliaris ; but apart from this difference in 

 the genital organs I cannot separate it by any satisfactory character from A. miliaris. 

 I have some other Central-American specimens (females) which are probably distinct 

 from any I have described ; but I am at present far from being clear as to the specific 

 characters by which they can be differentiated from A. miliaris. 



{ 2. Ammophila gaumeri. (Tab. II. fig. 2, <? .) 



Hah. Mexico, Temax in North Yucatan (Gaumer) ; Guatemala, San Geronimo 

 (Champion). 



Similar in form and colour to A. miliaris ; but differing in the clypeus being almost 

 flat (not produced broadly in the middle and depressed at the apex), with its apex not 

 so sharply truncated, the curve from the sides being longer and more gradual, and also 

 in having a broad well-defined border to it; the mesonotum wants the velvety 

 appearance ; the metanotum is not transversely striated, but opaque and granular, and 

 the edges only show traces of striation ; the petiole is shorter ; the second cubital 

 cellule is broader at the top, the nervures not approaching each other, so that the top 

 is half the length of the bottom (in A. miliaris it is not one sixth) ; the recurrent 

 nervure is received before the middle (not at the middle as in A. miliaris) ; the 

 front ocellus is more widely separated from the posterior ocelli; the pronotum is 

 not raised in the centre and is broader above; the sternum is alutaceous and not 

 tuberculate ; the third antennal joint is more than twice the length of the fourth ; and 

 the pleurae, coxae, and abdomen are of a much more decided bluish tint. 



The pile all over the body is sparse ; the face and clypeus want the silvery pubescence 

 entirely, and on the thorax it is only visible on the tubercles and on two spots on the 

 apex of the metanotum. In the centre of the mesonotum is a depression which is 

 prolonged as a distinct furrow towards the base, and there is a depression on either 

 side close to the tegulae. The puncturing on the mesonotum is rather close, but not 

 very strong. The scutellum is opaque, closely punctured, the punctures at the apex 

 running into longitudinal striations. The postscutellum is rugosely punctured. The 

 hind tibiae and the base of the tarsi on the inner side are covered with a fulvous pubes- 

 cence ; the other parts of the legs are almost devoid of pile. 



